 Photodetection systems are used in a number of ways, from imaging biological cells to taking pictures with a cell phone camera. A photodetector is composed of an array of devices called photodiodes, which absorb light to produce electric current. Because many photodetector materials are sensitive to light of a wide range of wavelengths or colors, photodiodes designed to detect a specific color often use absorptive filters to achieve the desired color response. In this study, photodiodes that respond to a narrow range of wavelengths without requiring a filter were fabricated using an emerging class of semiconductors called organohalide-led perovskites. These narrow-band photodiodes could hold great potential for detecting the pure color of objects regardless of the light source. Developing a photodioded material that responds only to light of a specific color is challenging. The material must be able to generate a strong electrical signal in response to light within a narrow range of wavelengths less than 100 nanometers, and ideally, it must do so with high efficiency and at a fast rate. In this study, this task was addressed by setting an upper and lower limit on the range of wavelengths absorbed and exploiting a phenomenon by which different wavelengths generate charges at different depths in the active material. For setting an upper absorption limit, organohalide-led perovskites are advantageous because their absorption range can be easily tuned by adjusting the ratio of their halide components. Setting the lower bound of absorption, however, required a more drastic adjustment to the absorption spectrum of the active material depending on the color detected. To detect red light, this was achieved by adding an organic molecule, Rotamine B, that could alter the absorption spectrum of the active film at low wavelengths while preserving the upper bound of absorption. With the desired boundaries of absorption established, the remaining task was to get the photodiod's charge carriers, namely negatively charged electrons and positively charged holes, to produce current only within that narrow absorption window. Short wavelengths of light generated charge carriers mainly near the surface of the active film, preventing efficient charge collection. Longer wavelengths, however, generated charge carriers deeper in the active material, making their contribution to the collected current signal much greater than the contribution from shorter wavelengths. Ultimately, only the longer wavelengths within the desired absorption window produced a measurable electrical response, allowing narrow-band color sensitivity. Photodiods sensitive only to red light were produced using this approach. To create photodiods sensitive to green or blue light, a slightly different organohalide perovskite or lead halide film containing a polymer additive was used. The photodiods represent a new breed of truly narrow-band and filterless red, green, and blue photodetectors. And their performance rivals that of current commercial systems that do require filters, highlighting the potential of organohalide perovskites in similar materials in producing low-cost, next-generation optoelectronics.